Malicious PDF — malware analysis report

Static analysis result for SHA-256 4341553c9fec8191…

MALICIOUS

PDF

83.6 KB Created: 2021-04-01 12:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39c2c7167ca0eec0d42cd6095f41df47 SHA-1: 882e01cbe5ab5d7b38bb79c9520d9b8b8815ddc2 SHA-256: 4341553c9fec8191a803e0346780bf8d215faa0094ee038e281c2a9be69808dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/award?keyword=artist+statement+sample+pdf PDF link annotation
    • http://kasyanbeauty.com/how_to_check_stock_market_graphhumlg.pdfIn PDF document text
    • http://edaeda.moscow/blood_bowl_ogre_team_2019_rulesb6fom.pdfIn PDF document text
    • http://youla-24.cc/57961393698jadc6.pdfIn PDF document text
    • https://wodarobasuk.weebly.com/uploads/1/3/5/3/135300597/7912593.pdfIn PDF document text
    • http://kubisobej.22web.org/67426018383.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/vetewogakasejugu.pdfIn PDF document text
    • http://abreudesigns.com/38061840305fxooh.pdfIn PDF document text
    • http://legovimoz.iblogger.org/70630153439.pdfIn PDF document text
    • http://itgermany.net/facebook_ads_billing_report81u8q.pdfIn PDF document text
    • http://smartcreditus.info/are_magic_bullet_cups_dishwasher_safet9gfu.pdfIn PDF document text
    • http://ourfutures.space/android_9_call_recording_without_root9i7wk.pdfIn PDF document text
    • http://turistik-a.ru/cronologia_politica_siglo_xix_espaahha6o.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/cPhTCif/39076472212.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/iejhlpe/wovuzisirena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobosebaj.rf.gd/zamosamobebemi.pdfIn PDF document text
    • http://wozunitififut.epizy.com/cookie_sheet_cake_icing.pdfIn PDF document text
    • http://kutobolasiwe.rf.gd/baloterekageb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 5176 bytes
SHA-256: d4d17313c58323fa619b55f441dc1074a787a261f945cf247332609b3800c521
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 12388 bytes
SHA-256: d29b79de76658ab89321fe814c4ad188209e06a9ad548b1c3c1e1fdea0bff04e